Genetics help! A long winged male crow with a head ruff mates with a short winge
ID: 187311 • Letter: G
Question
Genetics help!
A long winged male crow with a head ruff mates with a short winged crow without a head ruff. All of their male offspring have long wings, half of them have a head ruff and half lack a head ruff. All of the female offspring have long wings and half have a head ruff and half do not. A) Are either of these genes sex-linked? B) What is your reasoning? C) What is the most likely genotype for each parent and type of offspring? (4 pts)
7) A homozygous white-flowered plant is crossed with a homozygous dark purple-flowered plant. All of the seeds grow into pale purple-flowered plants. A) If there is no dosage effect, is it more appropriate to write the genotype for the white-flowered plant “WW” or “pp”? B) What is your reasoning? (3 pts)
7) You cross a RrBb male with an rrBb female. If they had 64 children, how many would you expect to be rrBb? (2 pts)
8) If a couple has 5 children, what is the probability that they will all be girls? (1pt)
9) Hunchback serves as a silencer protein for the gene encoding Ultrabithorax. A) Which
of these two genes is epistatic to the other? B) How do you know? (1pt)
6) A long winged male crow with a head ruff mates with a short winged crow without a head ruff. All of their male offspring have long wings, half of them have a head ruff and half lack a head ruff. All of the female offspring have long wings and half have a head ruff and half do not. A) Are either of these genes sex-linked? B) What is your reasoning? C) What is the most likely genotype for each parent and type of offspring? (4 pts) 7) A homozygous white-flowered plant is crossed with a homozygous dark purple-flowered plant. All of the seeds grow into pale purple-flowered plants. A) If there is no dosage effect, is it more appropriate to write the genotype for the white-flowered plant "Ww" or pp B) What is your reasoning? (3 pts) 7) You cross a RrBb male with an rrBb female. If they had 64 children, how many would you expect to be rrBb? (2 pts) 8) If a couple has 5 children, what is the probability that they will all be girls? (1pt) 9) Hunchback serves as a silencer protein for the gene encoding Ultrabithorax. A) Which of these two genes is epistatic to the other? B) How do you know? (1pt)Explanation / Answer
(6)
Answer:
A long-winged male crow with a head ruff = LLRr
short-winged crow without a head ruff = llrr
LLRr x llrr
Gametes: LR, Lr, lr
Offsprings: LlRr, Llrr (all the offsprings have long wings and half of them have a head ruff and half do not)
A) Are either of these genes sex-linked?
No, they are not
B) What is your reasoning?
If they are sex-linked all of the male offsprings would have head ruffs
C) What is the most likely genotype for each parent and type of offspring?
Genotypes of the parents= LLRr x llrr
Genotype of the Offsprings: LlRr, Llrr
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